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Hi Mark
adult Lonchaeidaee not too diffivcult to do if you have a microscope - the key characters relate to the number / colour of setae on the body and the shape of the genitalia - however these do not show up well on photographs! so only a very few spp can be identified on this site. Perhaps I was being a bit pedantic by saying adult! - the larvae of most British species can be identified from the shape of the head skeleton - its all laid out in MacGowan, I. and Rotheray, G. E. 2008. British Lonchaeidae. Diptera, Cyclorrhapha, Acalyptratae. Handbooks for the Identification of British Insects, Vol. 10 (15).